--- title: "How to make electric skateboard using Wi-Fi module" url: "https://maker.wiznet.io/annjaison/projects/How-to-make-electric-skateboard-using-WiFi-module/" markdown_url: "https://maker.wiznet.io/annjaison/projects/How-to-make-electric-skateboard-using-WiFi-module/md" type: "UCC: User Created Content" author: "annjaison" author_url: "https://maker.wiznet.io/annjaison/" original_author: "annjaison" original_url: "https://www.hackster.io/wiznet/how-to-make-electric-skateboard-using-wi-fi-module-7aacce" published: "2021-03-02" language: "en" hardware: ["WIZnet WIZwiki-W7500ECO", "WIZnet WizFi250"] likes: 0 views: 233 comments: 0 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # How to make electric skateboard using Wi-Fi module > How to make electric skateboard using Wi-Fi module Original author: annjaison (source: https://www.hackster.io/wiznet/how-to-make-electric-skateboard-using-wi-fi-module-7aacce) ## Components - **WIZnet WIZwiki-W7500ECO** x 1 - **WIZnet WizFi250** x 1 ## Documents and links - [code](http://maker.wiznet.io/uploads/2021/03/code.txt) (code) - [WIZwiki-W7500ECO](http://maker.wiznet.io/uploads/2021/03/wizwiki-w7500eco.pdf) (schematics): This is schematic of WIZwki-W7500ECO ## Article ## Story Hardware Materials ### **Skateboard Materials [34″ Cruiser Longboard Deck](http://diyelectricskateboard.com/product/34-kick-tail-slide-board/) [Trucks](http://diyelectricskateboard.com/product/torqueboards-v2-pro-trucks/) [90mm Wheels](http://diyelectricskateboard.com/product/90mm-longboard-epower-flywheels/) [Bearings 8mm](http://diyelectricskateboard.com/product/longboard-bearings-8mm/) ### **Materials for electric skateboard [Motor](http://diyelectricskateboard.com/product/electric-skateboard-sensored-epower-motor-5065-170kv-2200w/) [Motor Mount](http://diyelectricskateboard.com/product/welded-motor-mount-63mm-motor/) [44T Drive Wheel Pulley Adapter](http://diyelectricskateboard.com/product/torqueboards-v2-pro-trucks/) [12S 120A ESC](http://diyelectricskateboard.com/product/torqueboards-12s-120a-car-esc-opto-hv/) [TorqueBoards ESC Programming Card](http://diyelectricskateboard.com/product/torqueboards-esc-programming-card/) [12S UBEC\](http://diyelectricskateboard.com/product/12s-ubec/) On/Off Anti-Spark Power Switch](http://diyelectricskateboard.com/product/on-off-high-voltage-anti-spark-power-switch-2-14s/) For more detailed information, refer to this URL.? ### **Materials for Wi-Fi Receiver #### [WIZwiki-W7500ECO](http://wizwiki.net/wiki/doku.php?id=products:wizwiki-w7500eco:start) ![](https://hackster.imgix.net/uploads/image/file/88342/22574920582_0b0bd1e748.jpg?auto=compress%2Cformat&w=740&h=555&fit=max) #### [WizFi250](http://wizwiki.net/wiki/doku.php?id=products:wizfi250:start) ![](https://hackster.imgix.net/uploads/image/file/88343/22588501435_e7a657d443.jpg?auto=compress%2Cformat&w=740&h=555&fit=max) ### **Hardware Configuration for Motor control Already you know,PWM is need to operate DC motor. So I made PWM signal using WIzwiki-W7500ECO board and this picture is configuration for motor control. You need ESC(for controlling speed of motor) and UBEC(for input 5V to WIZwiki-W7500ECO). ![](https://hackster.imgix.net/uploads/image/file/88344/22582689761_60bef656d7_c.jpg?auto=compress%2Cformat&w=740&h=555&fit=max) 1 / 2 If you refer to this?[Link](http://www.life4iot.com/2015/10/30/electric-skateboard2-servo-motor-test/?lang=en), you can get more detail information and download source code for motor test. ### **Hardware Configuration for Wi-Fi Receiver Wi-Fi receiver is device for communicating control data with skateboard. I made Wi-Fi receiver using WizFi250 which is Wi-Fi module by WIZnet. This picture is configuration for Wi-Fi receiver. ![](https://hackster.imgix.net/uploads/image/file/88346/21942831093_babf60950c_c.jpg?auto=compress%2Cformat&w=740&h=555&fit=max) I am not hardware engineer so I couldn’t handle hardware well and this hardware may be showing some lack. But it’s operation is very well. In this device,it has 3 output pin and 2 input pin. Input pins are for getting voltage from battery and Output pins are for controlling motor. ![](https://hackster.imgix.net/uploads/image/file/88347/21963845954_7770d07e36_c.jpg?auto=compress%2Cformat&w=740&h=555&fit=max) ### **Wi-Fi Receiver Firmware ### **Source Code Firmware of Wi-Fi receiver is operated as belows. If smartphone push “Speed Up” button, Wi-Fi receiver will increase motor speed and It it push “Speed Down” button, Wi-Fi receiver will decrease motor speed about 5 percentage. ![](https://hackster.imgix.net/uploads/image/file/88348/22399292620_730a60f244_c.jpg?auto=compress%2Cformat&w=740&h=555&fit=max) In exception situation like disconnect Wi-Fi or socket, Wi-Fi receiver will stop motor as below. But even if motor is stopped, skateboard can’t stop because it has acceleration. ![](https://hackster.imgix.net/uploads/image/file/88349/22573801492_09031b517e_c.jpg?auto=compress%2Cformat&w=740&h=555&fit=max) You can download source code for Wi-Fi receiver at this?[Link](https://developer.mbed.org/users/kaizen/code/Wifi_Electric_Skateboard/) C++ ``` #include "mbed.h" #include "Servo.h" #include "WizFi250Interface.h" ? #define SECURE WizFi250::SEC_WPA2_MIXED #define SSID "Kaizen_Skate" #define PASS "qwertyuiop" ? #define SERVER_PORT????5000 #define STOP_MOTOR???? 50 ? ? #if defined(TARGET_WIZwiki_W7500P) ????WizFi250Interface wizfi250(PC_2,PC_3,PC_13,PC_14,PC_12,NC,115200); ????Serial pc(USBTX, USBRX); ????Servo motor_speed(PC_8);??????// it used to percentage value ( 0 ~ 1 ) ????DigitalOut green_led(LED2);???? ????DigitalOut red_led(LED1); ????DigitalOut blue_led(LED3); #endif ? #define START_MSG?????? "START" #define END_MSG???????? "ENDn" #define CONTROL_UP??????"UPXX" #define CONTROL_DOWN????"DOWN" #define CONTROL_CRUISER "CRUI" #define CONTROL_STOP????"STOP" ? #define STATUS_CMD_OK?? "OKXX" #define STATUS_CMD_FAIL "FAIL" ? #define CONTROL_MSG_SIZE????19 ? // Control Pkt Format : START,CONTROL,SPEED_VALUE,END //??????????????????????START,UPXX,500,END // Status Pkt Format : START,CONTROL,SPEED_VALUE,STATUS,END ? struct control_pkt{ ????char start_msg[6]; ????char control_msg[5]; ????char speed_msg[4]; ????char end_msg[4]; }; void parse(char buffer[], int *j, char *string); ? int main() {???? ????int recv_cnt,j; ????volatile float speed_value = 0.5; ????char recv_control_msg[100]; ????char status_msg[100]; ????control_pkt control; ? ????pc.baud(115200); ????green_led = 1; red_led = 1; blue_led = 1; ? ????wizfi250.init(); ????wizfi250.setAntMode(WizFi250::PCB); ????wizfi250.setAddress("192.168.100.2","255.255.255.0","192.168.100.1"); ????if ( wizfi250.connect(SECURE, SSID, PASS, WizFi250::WM_AP)) ????{ ????????red_led = 0; ????????return -1; ????} ????printf("IP Address is %srn", wizfi250.getIPAddress()); ????green_led = 0; red_led = 0; blue_led = 0; ? ????TCPSocketServer server; ????TCPSocketConnection client; ? ????while(true) ????{ ????????if( client.is_connected() == false ) ????????{ ????????????green_led = 1; red_led = 1; blue_led = 0;???????????? ????????????client.close(); ????????????server.close(); ? ????????????if(speed_value == 0.5) ????????????{ ????????????????server.bind(SERVER_PORT); ????????????????server.listen(); ? ????????????????printf("nWait for new connection...rn"); ????????????????server.accept(client); ????????????????client.set_blocking(false, 1500); ????????????} ????????????else if(speed_value <= 0.4) ????????????{ ????????????????printf("Speed decrease +rn"); ? ????????????????speed_value = 0.5; ????????????????motor_speed = speed_value; ????????????} ????????????else ????????????{ ????????????????printf("Speed decrease -rn"); ????????????????speed_value = 0.5;??motor_speed = speed_value; ????????????} ????????} ????????else ????????{ ????????????motor_speed = speed_value; ? ????????????green_led = 0; red_led = 1; blue_led = 1; ????????????//recv_cnt = client.receive_all((char*)recv_control_msg, sizeof(control)-1); ????????????recv_cnt = client.receive_all((char*)recv_control_msg, sizeof(control)); ? ????????????j=0; ????????????parse(recv_control_msg, &j, control.start_msg); ????????????parse(recv_control_msg, &j, control.control_msg); ????????????parse(recv_control_msg, &j, control.speed_msg); ????????????parse(recv_control_msg, &j, control.end_msg); ? ????????????if(recv_cnt > 0) ????????????{ ????????????????if( (strncmp(control.start_msg,START_MSG,sizeof(control.start_msg)) != 0) || ????????????????????(strncmp(control.end_msg,END_MSG,sizeof(control.end_msg)) != 0) ) ????????????????{ ????????????????????printf("TEST Errorrn"); ????????????????????sprintf(status_msg,"%s,%03d,%s,%sn",START_MSG,int(speed_value*100),STATUS_CMD_FAIL,END_MSG); ????????????????????client.send_all((char*)status_msg,strlen(status_msg)); ????????????????????continue; ????????????????} ? ????????????????if( strncmp(control.control_msg,CONTROL_UP,sizeof(control.control_msg)) == 0 ) ????????????????{ ????????????????????speed_value += 0.05; ????????????????????motor_speed = speed_value; ????????????????????printf("TEST UP %frn",speed_value); ????????????????} ????????????????else if( strncmp(control.control_msg,CONTROL_DOWN,sizeof(control.control_msg)) == 0) ????????????????{ ????????????????????speed_value -= 0.05; ????????????????????motor_speed = speed_value; ????????????????????printf("TEST DOWN %frn",speed_value); ????????????????} ????????????????else if( strncmp(control.control_msg,CONTROL_CRUISER,sizeof(control.control_msg)) == 0) ????????????????{ ????????????????????printf("TEST CRUISERrn"); ????????????????????speed_value = (float)(atoi(control.speed_msg)) / 100; ????????????????????motor_speed = speed_value; ????????????????} ????????????????else if( strncmp(control.control_msg,CONTROL_STOP,sizeof(control.control_msg)) == 0) ????????????????{ ????????????????????printf("TEST STOPrn"); ????????????????????speed_value = 0.5; ????????????????????motor_speed = speed_value; ????????????????} ????????????????else ????????????????{ ????????????????????printf("TEST Error 1-2rn"); ????????????????????sprintf(status_msg,"%s,%03d,%s,%sn",START_MSG,int(speed_value*100),STATUS_CMD_FAIL,END_MSG); ????????????????????client.send_all((char*)status_msg,strlen(status_msg)); ????????????????????continue; ????????????????} ? ????????????????sprintf(status_msg,"%s,%03d,%s,%sn",START_MSG,int(speed_value*100),STATUS_CMD_OK,END_MSG); ????????????????client.send_all((char*)status_msg,strlen(status_msg)); ????????????} ????????????else ????????????{ ????????????????sprintf(status_msg,"%s,%03d,%s,%sn",START_MSG,int(speed_value*100),STATUS_CMD_OK,END_MSG); ????????????????client.send_all((char*)status_msg,strlen(status_msg)); ????????????} ????????} ????}// while } ? void parse(char buffer[], int *j, char *string) { //extracts next location string data item from buffer ????int i=0; ????for (i=0; i<=strlen(buffer); i++) {??//TOTAL SIZE OF RETURNED DATA ????????if ((buffer[*j+i] == ',')||(buffer[*j+i] == '' )) { //IF comma or end of string ????????????//comma is the string field delimiter ????????????string[i]=0; //SETS END OF SRTRING TO 0 ????????????*j=*j+i+1; //UPDATES to 1 after comma seperated value ????????????break; ????????} else string[i]=buffer[*j+i]; //Keep adding to the string ????} } ``` Andorid Application ![](https://hackster.imgix.net/uploads/image/file/88350/21944762113_95e307aeee.jpg?auto=compress%2Cformat&w=740&h=555&fit=max) ### **Source Code --- Source: https://maker.wiznet.io/annjaison/projects/How-to-make-electric-skateboard-using-WiFi-module/